The Samsung one sounds really tempting. I would like to know what makes the Viofo 512GB more suited compared to the Samsung one. Are the ratings not the whole story? Viofo doesn't share any tests, and telling people to buy a Viofo card is obviously very biased. The Samsung 512GB card can be bought for ~half the price of the Viofo one.
Ratings might be the whole story, if you had all the information, but we never do. So a card that has a maximum temperature rating of 60°C might slow down a little when it reaches 60°C, slow down a little more at 80°C, but still be working fast enough when it reaches 100°C, while a card that has a maximum temperature rating of 80°C might slow down to unusable at 81°C.
Your actual experience with a card depends hugely on how you use it, what camera you put it in, what bitrates you have chosen in the settings, you climatic conditions, how/where you have mounted the camera, so it is not possible for Viofo to tell you which cards will work OK for you personally.
Viofo has tested some cards, and seen some cards cause problems for actual customers. They have given you some advice as a result. You can use that advice, or ignore it. They can't test every card in every climatic condition, you will not get better advice elsewhere.
For the Viofo card, they are described as Industrial Specification, which means that they should have a wider temperature range over which they work OK, and should have a longer life when used in normal conditions. I don't know how much longer, and Viofo choose not to give any specifications on lifetime, but in general you can expect an industrial spec card to work more reliable in higher temperatures and have double the lifetime. If it is double the price, that gives the same price per recording, plus better reliability. I can't say if that will be your experience, but that is what I expect. They are not standard consumer cards, built to be cheap and make maximum profit like the Samsung card is. Viofo make their money selling dashcams, not cards. I think they sell cards mainly in order to make their dashcams more reliable, for the people prepared to pay for reliability, and because it is hard to buy a decent industrial specification card at consumer prices.
We don't see many people having issues with Viofo cards, we do see plenty of people having issues with cards on Viofo's not recommended list. And when tested for speed in a fast card reader, the Viofo cards do outperform all the standard consumer cards, even the ones claiming to be fast!
